Basic Oxides of Metals

Q.

What is the reaction of calcium oxide with water?

Q.

What happens chemically when quicklime is added to water filled in a bucket ?

Q. Question 32
A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.

Q.

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

1. Calcium

2. Carbon

3. Silicon

4. Iron

Q.

What type of oxides are formed when non-metals combine with oxygen?

Q. Question 35
Balance the following chemical equations and identify the type of chemical reaction.

(a) $\text{Mg(s)}+{\text{Cl}}_2\text{(g)}\to {\text{MgCl}}_2\text{(s)}$
(b) $\text{HgO(s)}\stackrel{\text{Heat}}{\to }\text{Hg(l)}+{\text{O}}_2\text{(g)}$
(c) $\text{Na(s)}+\text{S(s)}\stackrel{\text{Fuse}}{\to }{\text{Na}}_2\text{S(s)}$
(d) ${\text{TiCl}}_4\text{(l)}+\text{Mg(s)}\to \text{Ti(s)}+{\text{MgCl}}_2\text{(s)}$
(e) $\text{CaO(s)}+{\text{SiO}}_2\text{(s)}\to {\text{CaSiO}}_3\text{(s)}$
(f) ${\text{H}}_2{\text{O}}_2\text{(l)}\stackrel{\text{UV}}{\to }{\text{H}}_2\text{O(l)}+{\text{O}}_2\text{(g)}$

Q.

The sodium metal can be stored in:

1. Benzene

2. Alcohol

3. Kerosene

4. Toluene

Q. Why all the metal oxide are base?

Q.

The element which forms a basic oxide has the atomic number of :

(a) 18 (b) 17 (c) 14 (d) 19

Q.

An element reacts with oxygen to form oxide which dissolve in dilute hydrochloric acid.the oxide formed turns a solution of red litmus blue. Is the element a metal or a nonmetal? Explain with an example.

Q.

out of Li , C and N which form the most basic oxide and which form the most acidic oxide?

Q. Is the product formed on burning the magnesium acidic or basic?
Explain this

Q. which two observations will be made when quicklime as added to water?Write any two uses of the product so obtained (3marks)

Q.

Quicklime$\left(CaO\right)$ is mixed with water to prepare a solution used for whitewashing the walls in our home. What is the common chemical name of the product generated by this mixture? After the whitewash is done $\left(C{O}_2\right)$ in the atmosphere causes the white color to intensify. Write a chemical reaction to explain how this happens.

Q.

Hydrogen reacts with strong metals to form metal hydrides.

1. True
2. False

Q.

Question 12 (b)

Give reason why sodium, potassium and lithium are stored in oil?

Q.

Write balanced equations for:
(a)a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(b)a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

Q.

An element E forms an oxide $E_{2}O.$ . An aqueous solution of $E_{2}O$ turns red litmus paper blue.
(a) What is the nature fo the oxide $E_{2}O$
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.

Q.

Which one of the following is not a neutral oxide.
(a) $CO$ (b) $H_{2}O$ (c) $N_{2}O$ (d) $N{a}_{2}O$

Q. Give reasons:
(a) Metals like $\text{Na, K, Ca}$ and $\text{Mg}$ are never found in their free state in nature.
(b) Iron loses its lustre over time whereas gold does not.

Q.

Three elements 'X', 'Y' , 'Z' having atomic number 11, 7 , 6 respectively react with oxygen to form their iroxides .

Arrange these oxides in increasing order of their basic nature.

Q.

(a) What type of oxides are formed when non-metals react with oxygen ? Explain with an example.
(b) What is the nature of oxides are formed when metals combine with oxygen? Explain with the help of an example.

Q. The oxides of metals which are least reactive can be reduced to their respective metals by simple heating.

1. True
2. False

Q.

Q.

What is the nature of the oxide of radium?

Q.

(a) With the help of examples, describe how metal oxides differ from non-metal oxides.
(b) Which of the following elements would yield: 9i) an acidic oxide, (ii) a basic oxide, and (iii) a neutral oxide?
Na, S, C, K, H

Q.

Question 16

Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Q. Discuss corrosion concerning copper and silver vessels.

Q.

Question 36
A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.

(a) Write the chemical formulae of X and Y.

(b) Write a balanced chemical equation, when X is dissolved in water.

Q.

Select from the following list:

$F{e}_2{O}_3,NO,PbO,M{n}_2{O}_7$.

(a) Basic oxide...........

(b) Amphoteric oxide ...........

(c) Acidic oxide ...........

(d) Neutral oxide...........